package _9练习类;

import java.util.Scanner;

public class StringBuilerExercise {
	
	

	public static void main(String[] args) {
		
		Scanner sc = new Scanner (System.in);
		System.out.println("请随机输入：");
		int n =sc.nextInt();
		
		String s= "zxcvbnmlkjhgfdsaqwerZXCVBNMLKJHGFDSAPWQ1234567890";
		
		StringBuilder st = new StringBuilder();
		
		for(int i=0;i<n;i++);
		{
			int a=(int) (Math.random()*s.length());
			st.append(s.charAt(a));
			
		}
		System.out.println(st);
		

	}

}